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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea267d17a0c1530c18d1d6044c0e0bc5d31527e719fb548bcb044889b1a3a0d' 
  AND token = 'tXYC+2q5zrTRPz62BBOw2NpdJ9XSzz7xgZ2l5dvCd00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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