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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f74dc46ebbd21b3b683c536eeb1bd9990240a86cef6d736dd718c75c44dc06f' 
  AND token = '4hjN4IMnjLh1T1mbIANQWKqr3xs3LTe7Tkx5Y0xRsHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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