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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fb29386cf2573812a22a676be7cd7e5ba060ee424fb830565721a52d1bb882' 
  AND token = 'qRvzauYCIjJON0lWV3PWuWfHKaZQZG4RUsW1Wob7qCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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