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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138ba335f5c72146400424794ece080ab72fb1cf834585b895465b0ccc848f18' 
  AND token = 'q66363gVF+35OSj2ULCnEV3hXVMsh5UE3lNfRzoQkqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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