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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799964884ddbe91756cba721dc93aea26b6e45294e6189b8d0f46fd4c148f7e2' 
  AND token = 'dWy9NeYmRfvzNF8BK2Jkt4EW+O2aFsVA49tXL7iqefc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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