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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3ea4744218595b46e2087e83dd53dda2e137f3bebc51d61ab36cc7873d673a' 
  AND token = '9VxbatP2nJrQQbEgtZmkkKpER/zZmXW/ZyzPBi2DCFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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