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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed8ace92a9dcb49a74b0447d0583a67890a4264af92fb00c690ac7e6c0531ce' 
  AND token = 'KxB3WhvAuj6XFjPHr36MWLtMMdn0PStnlfGzFNnS2PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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