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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8761aee6ba4aeb3adccb9ca75cb7300a66a704628d21388a41b8eb57e1392f61' 
  AND token = 'sOeV/ZWjL/DzVUooK1dCgWKz7l0b6bdFovORWhbm3og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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