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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bac63de96cd231eb4ba6215e2b5228c4f786ea9a2f475c2fd1ee03d6e9b809' 
  AND token = 'zjGw5GT2XWsiXNq+M1boPEiOHqtJDDq2gg2F+/nJj4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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