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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d6d2c5ea106a2b1e817566c5f903665d80e70c39fbaad08b420c5112b624db' 
  AND token = 'facYUVul6qRGXJIXGdNCqKDFziW5hfoGCszh83yfgBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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