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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1f680cc122fa95d0a0588da3f87b7bd0f634546bb343f182a6d7f317cde3f5' 
  AND token = 'G5WoFgHbblbloRjVBylR3u3rBt1o1IgpNDe82t6Du2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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