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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad9204b547f138608493527b25dce74a0141cda2b56a911d5e4dc1b9e5a31c3' 
  AND token = 'Lx7m4ex0TJ5u4W4aGcXlmpE+Cgor4lYK3L3twIlwXm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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