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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dfd32c9e2d6f04de1fe940f7c0265cfc9b0c819be8a52ffe90013f1f599569' 
  AND token = '6P5b/tHXp2sVzDTayLE+1qbNViXrTJl93mZNYW6MzvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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