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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0811cab883ae7b222e48616c9de5749961d5e067ca3126ccf31b39abd200d51c' 
  AND token = 'wLkCq0LVWicA+Z2NIwpfQT2+K57Fx8VlVXSs3e9pwWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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