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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a60ab3b59a481b4262e6e572cf7f9f28b89375e604933bef7d0a9e04e81e9d' 
  AND token = 'AYpZ8I7OWpLnZlRjClBIiPEX4ldFS50U6ll05ktIDYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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