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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5986b74a9fb8eb85d29958995556f7087ad34da9cbf7d3cbe08a118e80c1d3ff' 
  AND token = 'cfqnkisESyeqIsqtUSf+WAG+4GA2Dm6x3CmThPe1CNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}