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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0b40d9c853c416c939f9129fe742881da6a195033a0d9ccf4c4a4d77865d61' 
  AND token = 'JWQ4wgrLbqTsqSMl4tI7Q60j0G2ZJ4z9t+sa1RDcwpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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