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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9051dd5ba8e39e8330113cd1cffa316e3b02e7e8ad558a7623dd3c81e70bc111' 
  AND token = 'RRUJ1cv7WWFnsTrhyFB9j9qjf8bE2wHHGtUztWAgUic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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