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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81c47f5034954e5db8a3c33c3e4aae5fbe34e54a5ab92d03deace2d7c821bff' 
  AND token = 'Hu33GgmK2N8kr9sRUPIX7oe0p4Wv9DA8rG1nXTIgDGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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