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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87971f6801efdb002f8028c21dd83c714481c3fc0fdb7978ef1eddc6cf6d0d1' 
  AND token = 'rX2NMEfjer2zyYYUqMB94FsLXhywfdeG3/zWDjYwwYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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