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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940b3de0325a87905bdc9d65ae6c5f851ec427e9b46085691e6199bb7afe7de4' 
  AND token = 'P0xpuMevoHMNsHyGPfmIIUsHizk1hPbSs2yNcLNft10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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