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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02665f55609be938456ee302d6ce974fa9d2f37baeddbe39e5b33eccb99ab3e6' 
  AND token = 'Ni+jBV4skMpG7V++VCK8hZS3+VSCQ/pkMGvGR22sEa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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