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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71178fb7a3c2f09d1025bca9e9bf715e7b90b3ecf33703f7ca321257f385deb5' 
  AND token = '0wdFwxoyQoW4JImyktQCIpSONnExVojCHSqi6jj+ue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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