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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa71513f68c12851ee3f9c00a1319587dbdc657ee4eb17f2e56429f820e6ced' 
  AND token = 'ky3EsszjHaI4tQzZZ2r1gBwanh2Yal9nSlYkJMTuJ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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