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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ae086cc517d843c2563e5b8e50d593eb23c8b708d045aa413a3df7371fb620' 
  AND token = '41/kJuhiIrks5TpyZPi8gRqLM/DILo1pSzTwm9Me5m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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