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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f2899cfc33e660def1f180b91cc4f7a259d4843925891b992be68a6996c5e9' 
  AND token = 'd+bWltDQE6ry0Pb5YdqpX7GuJLqr9mZKmb/mwnlXGck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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