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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25352f7d93fbdca8276ebfc56e6b586c8c07586933bcafd19af2eb6c9650672' 
  AND token = 'zxVnPcSUooPRC85UtnEMeLcKmyc0EC6xwEUEi2if+9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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