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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa3b7a32d166f5f5ae530c408ec1ab1e9f42434edb8d2333d79d302905051f7' 
  AND token = 'MmH2V1ygW8bDQoG+6d2hsto9QADAwNDH66BqT9ymPWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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