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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1125a0f07b212a3ec52b18e8e9c777d149e0517f227f90e4500c119c74d32072' 
  AND token = 'nRFVMVS9D/WXnDf53pi4xGi3V4pIDP287gF18JifBdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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