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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6163c63d6a2fca7e189940823212584ec1ae8a630be9b193133d8e4bc2513d' 
  AND token = 'yfVj6O+uhoFTNMt88F2PY/0J6L/yciJOPS/EboNrC9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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