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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035ee432fffbbb7ad628121a59230de8d5252dc61363d79b0f115318aede8001' 
  AND token = 'TmPrIUfvB8RhSM4u51a8ZcriwOt53Og8BcAeKiRdpUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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