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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b66b9fd4294000e64746755fe8fb913f075276e7044593928ff4572635f4da' 
  AND token = 'HyyVRXLwE/+QxjeT1Kn69c65AsH/1+DkjArfv5mHjIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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