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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950984fbe56995f5974d4c36d369536e5aaa1667a10bb31ecc8238617bbd3f6d' 
  AND token = 'ZOuMuXITP79OrhR++4N1gid9SUJjvHQ/uhUSlbIfC4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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