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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f52091b34ec8068b6139e57c36cc3faf7b991cae0cf64f506aef406a7cfb45f' 
  AND token = 'M9VerzWicmUXO5cdjYP5CUrul03vAMBOmt3VxtV30gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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