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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e09477e1068dc6f00c90e547e9f714434bf15419f16cad61eef858e1ea335cd' 
  AND token = '2z855mDImFFGNwdH+E2O34McgnunLpzXtDKm/6zSV3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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