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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8ea58ad99132cf3f61abc9370de62356878c4eaa3dae06d8b6c0e24795cb89' 
  AND token = 'Z10za60/DBLwtqhr45PZYHlbLOQtR8g5kJSCj8lB0eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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