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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a58879ef9397d9f4b0bad8b2ee95c24f20eaf711c95e02c72ae793c9caea1f2' 
  AND token = '2l5qcpaPtG1lFcuSawSDpkdh+vVtEkaw+B2J/aZlstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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