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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a18220e66c7ce347ed2048bd60eb3b550655d4b62702e82bbd703b34a77351' 
  AND token = 'K8ZsqwupCLvZukvULmA88pyge/enPOUv+uEcPZiM6E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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