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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e877548cedceb88c22b1872efa04610bf7220f6413803fcee5c233a0e1d660ec' 
  AND token = 'e1ubG1L+XW7act1af4OQTKPIufbopZ1fo5GCK/DxKHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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