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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b778fb5dd511d2d95d5696c2a22257fbf17c6fb291cbd9e0395fd4c0eab89300' 
  AND token = 'HpEFTNq8qgjtJpray8CjWdC3aJy7Thsm6zC6dE3iQ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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