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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c19893f13559853c0ca327d546d886ca8cac05d710e7cba84bd2b212145973b7' 
  AND token = 'b2W1eNdMCXw0T8Sa8pOWDB/UjFzp47Tu0Yb/xQfS1pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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