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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1ec1129c56d1a459dd39bf67a957fff9b0ce0798d57a803d7fadeb1691ce1c' 
  AND token = '/sDG/CduorRYTecuxC23nCaUryLTjrsU68Ca/YjAryo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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