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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7889bf6fbf33b39bddd211bfdce55746526107ab33e5e21bae5686c80392cfb7' 
  AND token = 'm7lYwx7hRrol2F4Ytsy5+Maz2opdDNXGiNpTe1WA3TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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