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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8bd505fffa45223f02a13c212475f6d52c677dfe71646b0706269b7105b66a' 
  AND token = 'LQu/eHtKdjVmJZI05XEt2jVGyP7hNQJXqSr/aiGLhYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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