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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662074ff0779675fed173a2399d3d81e71e50fed76ad000d066a786fdc1063d0' 
  AND token = 'KKwsUjhQ3cnK+Y9K1r7gHRD0CgEJqFFDhwnD76DavUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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