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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dba260007dcadea84666c8bfd4597dbc8344ca68e62234f5a87116d5bef615' 
  AND token = 'DJrz+KlvIuY4XdtR7TAa6M78utR6lK9n9+rBE80FAWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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