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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7387823e1bf6ae9455f366e0c2b41d5befc7276ce1a2b700f2a81ac0347c122a' 
  AND token = 'Q8W8N/k3nHnaPfQzNm33HG6inZaCviqqVTloKWT1EL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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