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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fca8459b9fcfcdf24770a60b26d58d07f6c5feaf95f850c40e1bb0248f373df' 
  AND token = 'SbVNsWGX+y/6aB3tp20XtUVLdr6SRCPRXDH0buKoHXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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