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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdb7751cf5d83f4cff5252eab6c3c77ea203969809c3f8ea9d830f3f66efaf3' 
  AND token = 'CglxlG0y6TjP24KyuM36rC6UIlDfZbskq7AqEraLsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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