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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85876f7bbd043bf563865297cedb6d120bbb5734234fda8378e01eb3263a878c' 
  AND token = 'Bp5OVRL08vMEzBK97A8adhT7SYB07roozG+lC5jcXco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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