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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4306382b62a8ee9d02fa0e7039e508fdf83bf2686c223d2509324f3eb9837591' 
  AND token = 'addSuZtvUcr0faRP8ixgfNzP4nsD8sRJz/O+sHg/fg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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