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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37b0b42972dd24edc4bdec8328ec6ac19495954b3ce1f8768c2b94b6baab7fc' 
  AND token = 'm8+c+GYtfZWRjJ9Z+4RzJA1jvNXxa9Dc/KzKkjFjbD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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