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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb01e3537ab94a5a133852f7fcb8282b2d2edbaf65ad6c93ee565b8a9bb582c' 
  AND token = 'JWG2r8w7ITBTtWypD7sddpNebDP7vYky2IE4y67b2xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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