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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a8339d50e9137ef69668d91417da0b0f95e30090a76274b8c5b8c4956c879b3' 
  AND token = '2j7VlpSdK88nnC1/WSnkskDBuKIyzWjlUvUgXUBAFUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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