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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834542d3581ad24373d6352cb0cd06b91740bf3573279a2e1f41ed8f1db9b9cf' 
  AND token = 'NEgCinU7tYfFqglK73qG+ZYEDWAZaSkvq4xKkXbHAeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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