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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffc3859a62ae6b5f3d05e4aab7a4491234cca706510deb7408f527f83ef2656' 
  AND token = 'AenswAeykddp6zo1ZQmIoSiXZPViJqMWhaM8DOadNS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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